Common auxiliary accessories and refrigeration methods for industrial chillers

Common auxiliary accessories and refrigeration methods for industrial chillers

Commonly used auxiliary accessories for chillers include water flow switch, pressure controller, pressure difference controller, temperature controller and solenoid valve, as well as a brief introduction of three cooling methods, liquid vaporization refrigeration, gas expansion refrigeration and thermoelectric refrigeration.

　　 Common auxiliary accessories for chillers:

　　1, water flow switch

　　The water flow switch is used as the control or cut-off protection of the fluid flow in the pipeline. When the fluid flow reaches the set value, the switch automatically cuts off (or turns on) the circuit.

　　2, pressure controller

　　The pressure controller is used for pressure control and pressure protection. The unit has low and high pressure controllers to control the working range of the system pressure. When the system pressure reaches the set value, the switch automatically cuts off (or connects) the circuit. 　　3, differential pressure controller

　　The pressure difference controller is used to control the pressure difference. When the pressure difference reaches the set value, the switch automatically cuts off (or turns on) the circuit

　　4, temperature controller

　　The temperature controller is used as the control or protection of the unit. When the temperature reaches the set value, the switch automatically cuts off (or turns on) the circuit. In our products, temperature control is often used, and the temperature of the water tank is used to control the startup and shutdown of the unit. There are also temperature controllers that need to be used for antifreeze.

　　5, solenoid valve

　　 Cut off the system circuit when the compressor is stopped to avoid liquid shock when the compressor is started next time. Generally used in larger refrigeration systems.

　　Three cooling methods

　　 Liquid vaporization refrigeration:

　　1. Compression: the normal temperature gas state changes to high pressure and high temperature gas state

　　2. Condensation: high-pressure and high-temperature gas into high-pressure liquid

　　3. Evaporation: High-pressure liquid turns into low-pressure gaseous state, which absorbs heat and realizes cooling.

　　 Gas expansion refrigeration:

Gas expansion refrigeration uses the adiabatic expansion of high-pressure gas to reach low temperature, and uses the reheating process of the expanded gas at low pressure to refrigerate. Due to the different equipment for gas adiabatic expansion, there are generally two ways: one is to increase the high pressure The gas is expanded by the expander and has external power output, so the temperature drop of the gas is large, and the cooling capacity is also large during reheating, but the expander structure is more complicated. Another way is to make the gas expand through the throttle valve without external power output. The temperature drop is small and the cooling capacity is small, but the structure of the throttle valve is relatively simple, which is convenient for the adjustment of the gas flow.

　　 Thermoelectric cooling:

　　 The charge carrier moves in the conductor to form an electric current. Since the charge carrier is at different energy levels in different materials, when it moves from a high energy level to a low energy level, it will release excess heat. On the contrary, it needs to absorb heat from the outside (that is, it manifests as cooling).